CMS Made Simple Forums

Are you meaning something like this

http://forum.cmsmadesimple.org/index.ph ... 052.0.html

I think, that's not hard to realise.

You need more or less two user defined tags:

The first to get the article's teaser & link (use your provided code)

And the second to retrieve the full article (modify your existing code)

But be careful if it's not your own work which you include... it it (indeed) a copyright fraud...